US10888095B2 - Stable herbicidal compositions - Google Patents

Stable herbicidal compositions Download PDF

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US10888095B2
US10888095B2 US15/115,553 US201515115553A US10888095B2 US 10888095 B2 US10888095 B2 US 10888095B2 US 201515115553 A US201515115553 A US 201515115553A US 10888095 B2 US10888095 B2 US 10888095B2
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oxide
composition
herbicidal
salts
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US20170181434A1 (en
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Satish Ekanath Bhoge
Paresh Vithaldas Talati
Jaidev Rajnikant Shroff
Vikram Rajnikant Shroff
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UPL Ltd
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UPL Ltd
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Classifications

    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N57/00—Biocides, pest repellants or attractants, or plant growth regulators containing organic phosphorus compounds
    • A01N57/18—Biocides, pest repellants or attractants, or plant growth regulators containing organic phosphorus compounds having phosphorus-to-carbon bonds
    • A01N57/20—Biocides, pest repellants or attractants, or plant growth regulators containing organic phosphorus compounds having phosphorus-to-carbon bonds containing acyclic or cycloaliphatic radicals
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N25/00—Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application, e.g. seed treatment or sequential application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests
    • A01N25/02—Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application, e.g. seed treatment or sequential application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests containing liquids as carriers, diluents or solvents
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N25/00—Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application, e.g. seed treatment or sequential application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests
    • A01N25/30—Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application, e.g. seed treatment or sequential application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests characterised by the surfactants
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D81/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
    • B65D81/32—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents for packaging two or more different materials which must be maintained separate prior to use in admixture

Definitions

  • the present invention relates to an herbicidal composition particularly stable at lower temperatures.
  • the present invention provides a stable herbicidal composition comprising an inorganic salt of 2-amino-4-[hydroxy(methyl)phosphinoyl]butyric acid, (C 8 -C 20 )alkyldimethylamine N-oxide and an inorganic ammonium salt exhibiting excellent stability at low temperatures.
  • Stability of the pesticidal formulation has been of great concern when they are exposed to various changing weather conditions.
  • the stability of a formulated product may be influenced by many factors and is one very important factor in determining the efficacy of the formulation.
  • the formulations may undergo both physical and chemical changes depending upon the environment they are exposed to. Since many pesticides are for global market, the variability of climatic conditions under which the formulations are likely to be stored has to be taken into account while developing new pesticide formulations.
  • Low temperature stability is of particular importance for liquid based formulations when they need to be used or exposed in colder regions. Precipitation of active substance and/or surfactants as well as freezing of formulations during storage in low temperature climatic regions will lead to practical difficulties in handling the product and improper mixing in the tank which will result in poor bioefficacy.
  • adjuvants play a major role in determining the properties of a formulation as well as in enhancing the activity of the active ingredients
  • choice of suitable adjuvants is critical in deciding the bio-efficacy of a particular formulation.
  • smarter way for agrochemical formulators to move forward is to use better specific adjuvants and to reduce the volume of organic solvents.
  • parameters such as stability, solubility, compatibility, foam, suspension, spreadability penetration etc.
  • specific adjuvants have been developed to address these concerns, development of stable formulations incorporating these adjuvants remains as a challenge.
  • U.S. Pat. No. 3,527,593 discloses use of amine oxide as wetting agent in herbicidal compositions containing herbicides.
  • U.S. Pat. No. 4,168,963 discloses 2-amino-4-[hydroxy(methyl)phosphinoyl]butyric acid (referred to as glufosinate herein after), its salts, its isomers, and their derivatives including salts, possess a good and broad activity against weeds of many botanical families.
  • the L-enantiomer of glufosinate is regarded as being the biologically active isomer.
  • the ammonium salt of these compounds is particularly important. They are usually formulated as aqueous solutions.
  • water soluble active ingredients such as glufosinate ammonium is preferably formulated as aqueous solutions, solidification of formulation may happen at lower temperatures, especially with high concentration of the active ingredient and adjuvants.
  • U.S. Pat. No. 5,491,125 discloses liquid herbicidal compositions of Glufosinate.
  • the patent discloses use of several classes of surfactants which may be used to formulate glufosinate in its salt form.
  • the surfactants include non-ionic, anionic and a combination of non-ionic and/or anionic surfactants.
  • compositions stable at low temperatures, especially at sub-zero temperatures, while maintaining the bio-efficacy of the formulations.
  • Another object of the present invention is to provide a process for a herbicidal composition comprising glufosinate which is stable at low temperatures.
  • Yet another object of the invention is to provide a herbicidal composition comprising glufosinate which is bioefficacious.
  • Another object of the invention is to provide a herbicidal composition comprising glufosinate which can be used at low temperature.
  • the present invention provides a low temperature stable herbicidal composition
  • a low temperature stable herbicidal composition comprising 2-amino-4-[hydroxy(methyl)phosphinoyl]butyric acid, its salts, its isomers, mixture of isomers, derivatives or their lower alkyl esters or salts thereof with acids or bases, (C 8 -C 20 )alkyldimethylamine N-oxide and an inorganic ammonium salt.
  • a process for preparation of a low temperature stable herbicidal composition comprising 2-amino-4-[hydroxy(methyl)phosphinoyl]butyric acid, its salts, its isomers, mixture of isomers, derivatives or their lower alkyl esters or salts thereof with acids or bases, (C 8 -C 20 )alkyldimethylamine N-oxide and an inorganic ammonium salt.
  • composition comprising 2-amino-4-[hydroxy(methyl)phosphinoyl]butyric acid, its salts, its isomers, mixture of isomers, derivatives or their lower alkyl esters or salts thereof with acids or bases, (C 8 -C 20 )alkyldimethylamine N-oxide and aninorganic ammonium salt which is stable at low temperature for effectively controlling the undesired weed species.
  • Present invention is related to a herbicidal composition comprising glufosinate which demonstrates excellent stability at low temperature and is bioefficacious.
  • the present invention particularly relates to a liquid composition comprising glufosinate which is stable at temperatures below 0° C. even with high loading of the active ingredient/s and/or adjuvant/s.
  • U.S. Pat. No. 5,491,125 discloses liquid herbicidal formulations of glufosinate wherein variety of surfactants have been disclosed which can be used in the formulation.
  • the formulations suffer from the drawback of low temperature stability.
  • the formulations are either cloudy or have crystal formation or have solid separation when they are tested for stability at temperature below 0° C.
  • the formulations are said to be bioefficacious in controlling weed, they are not practicable due to low temperature instability.
  • the problem of low temperature stability of glufosinate composition can be overcome by using adjuvants wherein the adjuvants comprises a (C 8 -C 20 )alkyldimethylamine N-oxide and an inorganic ammonium salt.
  • Ammonium sulfate is known as a tank mix adjuvant for herbicides.
  • aqueous glufosinate salt composition with excellent stability at low temperatures prepared by using the careful combination of a (C 8 -C 20 )alkyldimethylamine N-oxide, an inorganic ammonium salt also demonstrate better bio efficacy.
  • a combination of the adjuvants of the present invention being found effective with a high load of active ingredient achieving excellent stability and bio-efficacy is surprising, in view of the known and identified fact that high concentrations of adjuvants are required in order to obtain effective weed control while using a glufosinate formulation.
  • the composition according to the present invention was found to be highly effective in controlling weeds.
  • the present invention provides a low temperature stable herbicidal composition
  • a low temperature stable herbicidal composition comprising 2-amino-4-[hydroxy(methyl)phosphinoyl]butyric acid, its salts, its isomers, mixture of isomers, derivatives, or their lower alkyl esters thereof or salts thereof with acids or bases, (C 8 -C 20 )alkyldimethylamine N-oxide and an inorganic ammonium salt.
  • the composition comprises 2-amino-4-[hydroxy(methyl)phosphinoyl]butyric acid, its salts, its isomers, mixture of isomers, derivatives, or their lower alkyl esters thereof or salts thereof with acids or bases preferably the racemate or its salts as the active ingredient.
  • the active ingredient may be selected from glufosinate, lower alkyl esters thereof or salts thereof with acids or bases such as its hydrochloride, monosodium salt, disodium salt, monopotassium salt, dipotassium salt, monocalcium salt, ammonium salt, —NH 3 (CH 3 ) + salt, —NH 2 (CH 3 ) 2 + salt, —NH(CH 3 ) 3 + salt, —NH(CH 3 ) 2 (C 2 H 4 OH) + , —NH 2 (CH 3 )(C 2 H 4 OH) + , or its methyl ester, ethyl ester, propyl ester or butyl ester.
  • acids or bases such as its hydrochloride, monosodium salt, disodium salt, monopotassium salt, dipotassium salt, monocalcium salt, ammonium salt, —NH 3 (CH 3 ) + salt, —NH 2 (CH 3 ) 2 + salt, —NH(CH 3 ) 3
  • the active ingredient is glufosinate ammonium salt.
  • the composition comprises from about 1% to about 50% by weight of glufosinate salt, between 5-50% by weight of the composition.
  • (C 8 -C 20 )alkyldimethylamine N-oxide is the adjuvant to be used in the present invention wherein, the nitrogen atom of the amine oxide bears at least one long chain aliphatic group having from 8 to 20 carbon atoms.
  • Examples of (C 8 -C 20 )alkyldimethylamine N-oxide include decyl-, dodecyl, tetradecyl-, pentadecyl-, and hexadecyl and octadecyl dimethyl amine N-oxides.
  • the preferred amine N-oxides are tetradecyldimethylamine N-oxide which also referred to as Myristyldimethyl amine N-Oxide and dodecyldimethylamine N-oxide which also referred to as Lauryl dimethylamine N-oxide.
  • the composition may contain from about 1% to about 35% by weight of (C 8 -C 20 )alkyldimethylamine N-oxide, more preferably it is from about 8% to about 30% by weight of the composition.
  • the inorganic ammonium salt is selected from salts such as ammonium sulfate, ammonium chloride, ammonium bromide, ammonium nitrate and ammonium nitrite.
  • the inorganic ammonium salt is ammonium sulfate.
  • the composition may contain from about 0.1% to about 10% by weight of inorganic ammonium salt more preferably it is from about 1% to about 7% by weight of the composition.
  • the composition further comprises one or more organic solvents.
  • the solvents may be selected from but are not limited to: a water miscible polar/non-polar or a water immiscible polar/non-polar solvent, for example; alkyl esters of phthalic acid and trimellitic acid; aromatic hydrocarbons such as xylene, solvesso-100, solvesso-150, solvesso-200, alkyl benzenes; methylnaphthalene; mixtures of aromatics aliphatic or cycloaliphatic hydrocarbon such as hexane and heptanes; phthalates; ketones such as cyclohexanone, 2-octanone or acetophenone, methyl isobutyl ketone-saturated or unsaturated cyclic ketones such as isophorone, chlorinated hydrocarbons; vegetable oils and modified vegetable oils; glycols and their derivatives; aliphatic alcohols, alkoxy aliphatic alcohols or mixtures of such
  • solvents can be alkylene carbonates (like propylene carbonate), alkyl amides, and esters such as alkyl esters of monocarboxylic acids and dicarboxylic acid, ester-amides, cyclic ethers such furan and its derivatives or mixtures thereof.
  • the organic solvent is selected from glycols and their derivatives, aliphatic alcohols, alkoxy aliphatic alcohols or mixtures of such two or more solvents.
  • the organic solvent is selected from glycols and/or alkoxy alcohols.
  • the composition comprises from about 1% to about 40% by weight of water miscible polar solvents, preferably it is from about 5% to about 20% by weight of the composition.
  • low temperature refers to temperature below 10° C., preferably it is below 5° C. and more preferably it is 0° C. and below 0° C.
  • the composition may comprise along with glufosinate or its salts other active ingredients selected from various classes of pesticides including fungicides, insecticides and herbicides, preferably with herbicides and mixtures thereof.
  • the actives may be preferably water soluble or water insoluble herbicide selected from: Diphenyl ether herbicides such as oxyfluorfen, acifluorfen and its salts, lactofen and its salts, fomesafen and its salts; Pyrimidinyloxybenzoic analogue herbicides such as pyrithiobac sodium, bispyribac sodium; Organophosphrous based herbicides such as glyphosate and its salts, bilanafos and its salts, bialaphos and its salts; Bipyridinium herbicides such as paraquat and diquat and salts thereof; aryloxyalkanoic acid herbicides such as 2, 4-D and its salts and esters, MCPA, MCPB and their salts; aryloxyphenoxypropionic herbicides such as haloxyfop, isomers and esters, clodinafop and its esters; Pyridine herbicides
  • composition comprising more than one active ingredient may be formulated in suitable ways, not limiting to soluble concentrate, suspension concentrate or emulsions oil-in-water or water-in-oil, micro emulsions and suspo-emulsions.
  • a process for preparation of a low temperature stable herbicidal composition comprising 2-amino-4-[hydroxy(methyl)phosphinoyl]butyric acid, its salts, its isomers, mixture of isomers, derivatives, lower alkyl esters thereof or salts thereof with acids or bases, (C 8 -C 20 )alkyldimethylamine N-oxide and an inorganic ammonium salt.
  • a process for preparation of stable herbicidal composition comprising mixing glufosinate ammonium in a formulation vessel with water and solvent followed by the addition of calculated amount of (C 8 -C 20 )alkyldimethylamine N-oxide and inorganic ammonium salt, and if required further customary adjuvants, solvents or other components such as wetting agent, coloring agent or defoamer followed by homogenizing the resultant mixture to obtain a clear solution.
  • the glufosinate composition according to the present invention may further comprise other agronomically suitable excipients such as surfactants, solvent, fertilizer, pH modifiers, crystallization inhibitors, viscosity modifiers, suspending agents, spray droplet modifiers, pigments, antioxidants, foaming agents, light-blocking agents, compatibilizing agents, antifoam agents, sequestering agents, neutralizing agents, corrosion inhibitors, dyes, odorants, spreading agents, penetration aids, micronutrients, emollients, lubricants, sticking agents, dispersing agents, thickening agents, freezing point depressants, antimicrobial agents, and the like.
  • excipients such as surfactants, solvent, fertilizer, pH modifiers, crystallization inhibitors, viscosity modifiers, suspending agents, spray droplet modifiers, pigments, antioxidants, foaming agents, light-blocking agents, compatibilizing agents, antifoam agents, sequestering agents, neutralizing agents, corrosion inhibitors, dyes, odorants
  • the surfactants may be selected from anionic, cationic or zwitterionic and/or nonionic surface active compounds (surfactants).
  • anionic surfactants include: anionic derivatives of fatty alcohols having 10-24 carbon atoms in the form of ether carboxylates, sulfonates, sulfates, and phosphates, and their inorganic salts (e.g., alkali metal and alkaline earth metal salts) and organic salts (e.g., salts based on amine or alkanolamine); anionic derivatives of copolymers consisting of EO (ethylene oxide), PO (propylene oxide) and/or BO (butylene oxide) units, in the form of ether carboxylates, sulfonates, sulfates, and phosphates, and their inorganic salts (e.g., alkali metal and alkaline earth metal salts) and organic salts (e.g., salts based on
  • cationic orzwitterionic surfactants may be selected from alkylene oxide adducts of fatty amines, quaternary ammonium compounds having 8 to 22 carbon atoms (C8-C22), surface-active zwitterionic compounds such as taurides, betaines and sulfobetaines.
  • nonionic surfactants are: fatty alcohols having 10-24 carbon atoms with 0-60 EO and/or 0-20 PO and/or 0-15 BO in any order; fatty acid alkoxylates and triglyceride alkoxylates; fatty acid amide alkoxylates; alkylene oxide adducts of alkynediols; sugar derivatives such as amino sugars and amido sugars; polyacrylic and polymethacrylic derivatives; polyamides such as modified gelatins or derivatized polyaspartic acid; surfactant polyvinyl compounds such as modified PVP; polyol-based alkylene oxide adducts; polyglycerides and derivatives thereof.
  • Nonionic surfactants may be selected from the group of the alkylpolyglycosides.
  • the anti-foaming agents may be selected from, but are not limited to silicon based and non-silicone based agents.
  • the silicone based agents may be selected from silicone oil, polydimethylsiloxane modified siloxane, and the non-silicone based agents may be selected from mineral oil based antifoams, vegetable oils, fatty acidsand its derivatives, fatty amines and its derivatives, fatty acid amides, substituted fatty acid amides and its derivatives, polyalkylene glycol and tributyl phosphate.
  • the colouring agents maybe selected from various formulation dyes known in the art.
  • composition according to the present invention may be tank-mixed with other actives or alternatively may be sold as a kit of parts containing actives and adjuvants that may be mixed prior to spraying or a ready mix kit of parts containing premixed compositions of the adjuvants and actives described above.
  • the adjuvants can be contained in a separate container.
  • the multi-pack herbicidal product includes an instruction manual instructing the user to admix the adjuvants with the active ingredient.
  • the multi-pack product optionally comprises containers containing other agents selected from other active ingredients and/or agrochemical adjuvants/surfactants that may be mixed prior to spraying.
  • the present invention provides a multi-pack herbicidal product comprising:
  • the active ingredient is mixed in a formulation vessel with water and solvent followed by the addition of calculated amount of (C 8 -C 20 )alkyldimethylamine N-oxide and ammonium sulfate. If required further customary adjuvants, solvents or other components such as wetting agent, coloring agent or defoamer can be added.
  • the resultant mixture is homogenized to obtain a clear transparent solution.
  • the formulation obtained is clear and no phase separation is observed at 54° C., 25° C., 14° C. and 0° C. after 7/14 days as per CIPAC guidelines (MT 39.3), indicating that the composition is stable.
  • Sub-zero stability test has been done by keeping samples at ⁇ 5° C. for 14 days.
  • Inventors of the present invention succeeded in inventing a stable composition by the careful combination of glufosinate or its salts with a (C 8 -C 20 )alkyldimethylamine N-oxide such as Myristyl dimethyl amine N-Oxide or Lauryl dimethylamine N-oxide, an inorganic ammonium salt such as ammonium sulfate and combination of solvents such as glycols and alkoxy alcohols.
  • a (C 8 -C 20 )alkyldimethylamine N-oxide such as Myristyl dimethyl amine N-Oxide or Lauryl dimethylamine N-oxide
  • an inorganic ammonium salt such as ammonium sulfate
  • solvents such as glycols and alkoxy alcohols.
  • a composition of glufosinate ammonium (280 g/l) according the present invention was prepared as follows:
  • composition of glufosinate ammonium (150 g/l) according the present invention was prepared as follows:
  • compositions were prepared by in the following manner:
  • compositions obtained were clear and no phase separation occurred at 54° C., 25° C., 14° C., 0° C. and ⁇ 5° C. after 7/14 days indicating that the compositions were stable at all ranges of temperature.
  • sample 16 prepared according to Formulation 1 of U.S. Pat. No. 5,491,125
  • the adjuvant load is high
  • absence of ammonium sulfate leads to cloudy and hazy solution at low temperature indicating that the composition is not stable at low temperature.
  • Samples 1-15 of the present invention were prepared using active ingredients at varied concentrations, varied concentration and ratio of solvents as well as different alkyldimethylamine oxides and ammonium sulfate at varied concentration. It has been found that all these samples resulted in stable compositions at 25° C., 0° C. and ⁇ 5° C. after 14 days.
  • compositions of glufosinate ammonium prepared according to the present invention as the broad spectrum herbicide.
  • the compositions were diluted with water and optionally with other tank mix auxiliaries and applied at a water application rate of 300-5001/ha to crop and non-crop land containing many broad leave weeds, grasses and sedges.
  • compositions according to the present invention were compared with a sample prepared as per example 11 of US 2005/0266999 (comparative sample)
  • Sample 10 corresponds to 280 g/L of the glufosinate ammonium composition and was tested against the comparative sample of 280 g/L of glufosinate ammonium.
  • Sample 5 corresponds to 150 g/L of the glufosinate ammonium composition and was tested against the comparative sample of 150 g/L of glufosinate ammonium.
  • the samples of glufosinate ammonium prepared according to the present invention exhibited good weed control when compared with the comparative sample. It was further noted that the compositions according to the present invention was effective for variety of weeds and consistent and very effective weed control was observed even after 60 days of treatment while in the case of the comparative sample, though a comparable control was observed in the initial days, weak weed control was observed after 60 days of application. Interestingly, weed control using formulations of the present invention showed significant and enhanced weed control after 45 days which was consistent even after 60 days when compared with the comparative sample. Thus a persistent and long term weed control (residual weed control) on a variety of weeds has been achieved using the formulations according to the present invention.

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  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Dentistry (AREA)
  • Plant Pathology (AREA)
  • Pest Control & Pesticides (AREA)
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IN141/KOL/2014 2014-02-03
IN141KO2014 2014-02-03
PCT/IB2015/050383 WO2015114483A1 (fr) 2014-02-03 2015-01-19 Compositions herbicides stables

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AU (2) AU2015212525A1 (fr)
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DO (1) DOP2016000196A (fr)
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US12052993B2 (en) * 2018-05-25 2024-08-06 Upl Ltd Aqueous herbicidal intermixtures
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WO2019030102A1 (fr) 2017-08-09 2019-02-14 Basf Se Mélanges herbicides comprenant du l-glufosinate ou un sel de celui-ci et du glyphosate ou des sels de celui-ci
MX2020007564A (es) * 2018-01-17 2020-09-03 Upl Ltd Combinaciones herbicidas.
CN112423591A (zh) * 2018-05-25 2021-02-26 Upl有限公司 含水除草混合物
CR20230380A (es) 2021-02-05 2023-10-12 Basf Se Composiciones herbicidas liquidas
WO2023239303A1 (fr) * 2022-06-07 2023-12-14 Hydroemission Corporation Pte. Ltd. Compositions de traitement de plantes et leur préparation
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